While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

The modern birthplace of Irish freedom.

This medieval footbridge in the Swiss Alps is known to attract cliff-jumping daredevils.

If James Bond bungee-jumped off the side of a 720-foot dam, would you do it too?

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The pedestrian traffic signals in Brazil's teeming metropolis light up with clues to nearby landmarks.

An enigmatic mural hiding in plain sight in one of São Paulo's busiest metro stations.

Ella Fitzgerald, opera singer Enrico Caruso, and dancer Isadora Duncan all performed in this lavish, supposedly haunted theater.

This singular art museum in São Paulo is unique inside and out.

These elaborate gothic monuments honor Verona's medieval lords.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Memorial full of frescoes, in the middle of nowhere.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Pilgrimage site for star-crossed lovers.