The only remaining U-boat that is still floating never actually saw any action in World War II.

Welcome to the world's only museum dedicated to the Ukranian Easter egg.

No need to strap in for a "ride" on this walkable roller coaster.

This historic stone bridge has an entire neighborhood clinging to its sides.

This "floating railway" is one of the world's oldest monorail systems.

Living trees form the structure of an open-air palace.

When the rain falls, this drain system turns into a musical instrument.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

World's largest barrel containing an inn.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Tiny castle in the middle of the Rhine made you pay to pass.

The world's biggest pet store.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

There are two dozen tanks just sitting in an open field in Lower Saxony.

The last bastion of Roman presence north of the Alps looms over a German town.

The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

Enter the cabin of a life-sized Hindenburg replica.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

A former ironworks that was the first UNESCO industrial site.

This 600-year-old home seems to defy physics.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

An elevator into the Baltic Sea.