The largest library in Latin America owes its existence to an Old World earthquake and a Napoleonic invasion.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Enigmatic bug-like sculptures mystify drivers along a Swedish highway.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This cobblestoned medieval-style town was entirely constructed in the 1990s and 2000s.

Beautiful public park off the beaten path and away from tourists.

A modern, secular take on a traditional Virgin Mary motif.

A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Art and a pun, all in one.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The most visited, and possibly most controversial, museum in Germany.

Cold war icon and onetime "hole" in the iron curtain.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

A Nazi concentration camp and Anne Frank's place of death.

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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Swedish mice can dine at the Nuts of Life restaurant or take a date to the amousement park.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.