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

This cemetery features modernist statues as strange as its name.

Barça football fans might see the insignia hidden in a church window as a divine sign.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

An abandoned monument remembering the "Pančevo Holocaust" now stands as a shadow of its former self.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

The Natural History Museum that time forgot.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

The oldest surviving botanic garden in the United States.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

The first American department store, and home to the largest operating musical instrument in the world.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Dr Barnes' $25 billion private collection of art and arboretum.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Huge masonic hall in Philadelphia with lavishly themed rooms.