This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The world's oldest rose is so tough it survived being bombed in World War II.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

In this quiet village, a blue plaque marks the spot where the famous fictional detective retired.

This medieval "painted village" is famous for its geometric facades.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

This strange sculpture is an enigmatic icon of this medieval German town.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

A collection of old neon signs from all over Poland line a secluded courtyard.

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

An underground city of salt.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

This German bone house contains the remains of some 20,000 souls.

A famed artist's inspiring work of peace and tolerance.

Legendary site where an evil bishop was devoured by rodents.

This marvelous array is one of the largest collections of mechanical instruments in Europe.

The many—66 to be exact—faces of the German forest.

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

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

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

Every half hour the eye-rolling clock face sticks out its tongue to mock the good citizens of Koblenz.