Artist Danielle Jacqui decorates nearly every inch of her home inside and out with her work.

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

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

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

A completely underwater art museum sends a stark message about humans' impact on the environment.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The first museum in the world devoted to sexual gadgetry.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

An art world insider finds himself battling for his artistic home.

This derelict superstructure was a very important warning system for the Soviet military.

A Japanese concept restaurant that feels like a party thrown by the monsters in your closet.

An Orwellian sculpture with eyeball cameras watches passersby.

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

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

Large Hadron Collider and the Birthplace of World Wide Web.

A church of bones, decorated with 40,000 human skeletons.

Macabre astrological automaton clock dating to the late 1400s.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Legends surround this jagged rock formation in the New Mexico desert.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.