Ängsö Castle is a castle

Castle

A castle is a type of fortified structure built in Europe and the Middle East during the Middle Ages by European nobility. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble...

 in Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

, located near Västerås

Västerås

Västerås is a city in central Sweden, located on the shore of Lake Mälaren in the province Västmanland, some 100 km west of Stockholm...

.

The castle is on the island of Ängsö

Ängsö

Ängsö is a Swedish National Park. It lies in Stockholm's skärgård, between Norrtälje and Stockholm. The park can only be reached by water.-External links:* from the Swedish Environmental Protection Agency...

. It was first named in a royal charter

Royal Charter

A royal charter is a formal document issued by a monarch as letters patent, granting a right or power to an individual or a body corporate. They were, and are still, used to establish significant organizations such as cities or universities. Charters should be distinguished from warrants and...

at the end of the 12th century.

Ängsö Castle has been occupied by the Sparre and Piper families, who have extended and rebuilt the original stone building. It gained its current appearance in the 1740s.

The castle is open to the public.