A tunnel with windows, so you don't miss out on the impressive views.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

To find the "unicorns of the deep" you've got to go downstairs.

One of the largest underground systems runs under Canada's largest urban center.

A surreal statue honoring Prague's favorite literary son.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

This bridge was constructed from the rubble of the infamous Bastille.

The Uros people live on floating reed islands in lake Titicaca.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

There has been an astronomical clock on this spot since the 14th century.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A former ironworks that was the first UNESCO industrial site.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

A little sculpture with a large wardrobe.

Christ's blood preserved in a Belgian town.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Ancient snack bar of the Roman Empire re-opened.

The "Prussian Versailles" that is as glorious today as when it was built.

Monument to a suicide protesting the Soviet invasion.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

A building so large that it has its own weather.