This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

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

A sculpture serving as an homage to Pope John Paul II.

Ancient ruins hidden underneath a modern luxury hotel.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The unusual sculptures are believed to be powerful political symbols.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A misnamed well, with a deep dark past.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The Uros people live on floating reed islands in lake Titicaca.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

In the heart of Medellín, an artsy urban complex sets the stage for demonstrations and protests.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

A celebration of Colombia’s premier contemporary artist.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

Towering high above the neighborhood of La Candelaria, the church is easily recognizable by its distinctive red-and-white striped facade.