Västerås is by Swedish standards a quite large city, with about 130,000 inhabitants (100,000 in the city proper), which makes it the sixth largest city of Sweden. Västerås is also one of Sweden's older cities, being established in the 1240s or earlier.
The city name is derived from Västra (west) Aros (old Swedish name for river mouth). The small river (creek) is the Black River crossing the city and opening to Lake Mälaren.
Bishop Johannes Rudbeckius founded Sweden's first high school (gymnasium) here in 1623.
Västerås has preserved a selection of older buildings, both by the creek and around (and north of) the city's small Cathedral. They all give the town a bit of a small town atmosphere. Unfortunately hundreds of old houses were demolished, roughly between 1950 and 1975, during one of the country's most thorough city modernization projects. There are however several modern buildings of some architectural interest.
Västerås is known for the Asea Brown Boveri (ABB) electrical industries (formerly ASEA).
Once in Västerås, almost every attraction is well within walking distance or can be reached in no time by public transportation. The city is not very touristy, which could be considered a good thing. This is one of the larger industrial cities in provincial Sweden, situated 110km to the west of the capital.
If you are spending a day in Västerås we recommend that you start at the train station, and then walk through the Vasa Park, to the Museum of Art . Then continue to the Turbine House, which is one of Sweden's first power plants, constructed in 1890 by ASEA. From here you can view the castle , famous for the Parliamentary decision of 1527 when King Gustav Wasa abolished Catholicism in Sweden, making Sweden a protestant country. The Västerås castle was originally erected around 1200, but what is seen of the castle today was built by Gustav Vasa mid 1500. The castle is a rather ugly building clearly meant for defence and not to impress by look. Nowadays it is a museum.
Later on you may want to follow Svartån creek northwards to the older parts of Västerås (Stora Torget and the surrounding streets are especially nice), where you also find the old Cathedral dating back to the 13th century. The cathedral is definitely worth a visit. The oldest parts of the cathedral was built around 1200. The oldest son of Gustav Vasa, Erik XIV, is buried in the church. Erik XIV is mostly famous because he was killed by poisoned pea soup. Summertime appointments for guided tours can be made between 11 am and 1 pm at the tourist office. A stone's throw from the Cathedral lies Church Hill (Kyrkbacken), which is the only major part of central Västerås not destroyed by the building programs of the 1960s. Really nice surroundings, where you can walk on the small and winding lanes and look at some of the oldest buildings in Västerås and, if you like, visit local arts and crafts shops.
Anundshög, which lies a few kilometers west of Västerås, is a nice place for a picnic during the summer. Anundshög is an ancient burial mound, 14 metres high and 60 metres across, making it the largest in Sweden. Next to the mound there is two big stone-ships. Take bus 40 towards Tortuna or go by car.
If you like music you should try the jazz club Village  or the new concert hall  (tickets at Västerås tourist office housed in the same building, just a short walk from the railway station). Sadly the Village jazz club has recently closed due to financial problems, hopefully it will resurrect itself, but almost certainly not in its old building.
ArosFortet  is an indoor adventure facility challenging creativity and cooperation in group exercises. From city centre follow Kopparbergsvägen to the north, cross E18, then on the righthand side (about 2 km walking distance from city centre).
There is a quite new bowling facility with a restaurant on Torgatan 1 in the city centre. Book in advance especially on Friday and Saturday evenings.
Kristiansborgsbadet is a bathing facility with a traditional 25 m pool and a separate section with moist and dry sauna, and cold bath (Romerskt bad). Recommended.
Djäkneberget close to the Cathedral has a nice park featuring hundreds of stones with inscriptions (quotes and names of people) from the enigmatic Sam Lidman that founded the park in the 19th century.
If you have kids try Lögarängsbadet west of Västerås (a couple of kilometers).
If you have half a day or so and transportation is arranged, you can visit the silver mine in Sala about 32km to the north on 67. Just follow the signs to Sala and the "Silvergruvan" is on the left. They give tours each day down into the mine. It's quite an experience both for adults and kids.
If you're interested in crafts, there's a beautiful pottery along Black River called "Krukmakeriet". It's open on Fridays and Saturdays and you will probably buy from the potter herself. She makes everything by hand and uses techniques like stoneware and raku. It's located close to the cathedral just next to Black River. Take a walk from Stora Torget, head north on the left hand side of Elite Stadshotell, cross the road after 100 meters, turn left til you get to the river and then turn right. You will see the "Krukmakeriet" on the right hand side after a couple of hundred meters. You will find everything from small candleholders to pieces of art.
If you have a tight travel budget and also want to avoid famous hamburger chains, try to grab a Kebab with pita bread on restaurant TipTop on the Sigma square. Otherwise choose the vegetarian lasagna at Cafe Gränden, Sturegatan in the city centre.
Some of the city's most classic and oldest restaurants are restaurant Stadskällaren, Stora Torget, and Piazza di Spagna on Vasagatan. The latter is worth a visit just to meet the always friendly staff.
If you are planning on staying the night and want to experience something slightly different, one of the special hotels by the artist Mikael Genberg is recommended: The Hotel Woodpecker is a single room tree house in the middle of the Wasa Park. The cost per night is around 1000 SEK. The same artist is also responsible for a unique one-room hotel in the lake! The bedroom is underwater.
If you walk along the river down to the lake you will find a little ferry port on your left side. Boats take you to some of the islands in the lake such as Elba or Ridö. It's a nice way to spend a day or a half.
Björnö is the city's main island. It's easy to find, as there are signs everywhere. It's connected to the main land with a little bridge. There is a nice beach, walking tracks and the possibility to hire kayaks and other boats at Björnögården. In the winter you can rent skies and skates.
Another really nice island is Ängsö just 15 km out of town. Take E18 West, towards Stockholm till the Airport Exit, from the roundabout just follow the signs saying "Ängsö". It's a beautiful island with a little castle, a church, a small cafe where you sit right by the water, and lots of hiking and bike tracks through the beautiful landscape. There's tons of space to relax on the cliffs by the water all by yourself, have a barbecue or swim. A must, when you're in town!WikiPedia:Västerås Dmoz:Europe/Sweden/Västmanland County/Localities/Västerås/ World66:europe/sweden/vsters