When the Swedish Parliament building got a facelift in the late '70s, plans involved the construction of an underground garage, which unearthed a whole host of archaeological finds. Instead of carting these off to a warehouse, a museum was built on-site in 1986, with its entrance roughly between the royal castle and the opera house. The parliamentarians had to make do with a smaller garage to provide room for the 850 objects on display today. Seasoned archaeology buffs are warned to keep expectations in check, however. While Italians seem to find a Roman temple every time they stick a shovel in the ground, pickings are more austere in Sweden. The collection centers on the genesis of Stockholm and the city’s development, and shouldn't take you more than 2 hours to absorb. Highlights include a church, a gallows, a graveyard, and remnants of a city wall from the 1530s. Plus, of course, it's very cool that the premises themselves are part of the story. Don't miss the king's secret tunnel from the castle.