Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

The door to the museum holds a unique artifact from the Finnish Civil War.

This church also serves as a lighthouse complete with a beacon.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

On a small island, a replica of a Finnish village from the Iron Age.

A small island dotted with old, historic Finnish buildings.

A collection of collections ranging from dentistry to minerals.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

At this exhibit on the world of poison, venomous animals steal the show.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

This 19th century cyclorama acts like an analogue time machine to a different era.

The amazing wonder cabinets of a very rich Austrian archbishop.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

A sculpture of the beloved author surrounded by characters from his fairy tales.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

A massive sculpture of an obscure Celtic coin that has become a symbol in Slovakia.

The largest fountain in Bratislava.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.