A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

A huge old mansion full of thousands of toys, each there to be used and played with.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

One of the deepest indoor swimming pools in the world.

Atop this library is one of the most beautiful green spaces in Warsaw.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

A statue honors the children who fought Nazis in Poland.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The topiary maze at the Habsburg hunting lodge.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

Countless grotesque faces stare out from this eerie Prague art wall.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

The silly symbol for an underground protest group is now scattered around the city.

The hidden lair of an alchemist rediscovered in a 2002 flood.

This man-made mound monument was built out of soil from all across the Polish empire.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A slice of central Asia in the middle of Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

This house's itty bitty size means no humans allowed.