Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

This artificial cave looks like something out of a fairytale.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

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

A Jenga-style cylindrical tower of books that appears to go on forever.

This riverside restaurant has been serving customers since 1146.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This lurid German fountain plots the sad course of marriage from dating to death.

Carved fountains poignantly placed in parks and in front of special monuments.

Fantastic views and thousands of love locks.

Museum covers every step of the chocolate-making process, from cultivation to the finished product.

Cozy basement bar sports an inventory of over 2,000 beers.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Descend into the tunnels to experience the life of a coal miner.

A wonderfully kitsch bookstore the size of a supermarket.

A little sculpture with a large wardrobe.

One of the deepest indoor swimming pools in the world.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.