This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

A study of Fascist era Art Deco design in Italy.

A haunting collection of the vanished and disappearing natural world.

A museum of carnival attractions where you are invited to ride the rides.

One of Western Africa's oldest mosques, this Timbuktu icon has stood for nearly 700 years.

Palace where the nearly un-killable Rasputin was murdered.

A model village fit for an emperor.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

A beloved tribute to the Fab Four and the freedoms they inspired.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

An eerie abandoned gentlemen's club built for British officials during the colonial era.

Huts like this were once a hub for the female divers who collected pearls and seafood off Japan's coasts.

A rare chance to ride one of the few continuous elevators still in operation.

This abandoned Brutalist treehouse is a hidden architectural relic.

Eritrea's futuristic gas station is a nod to Italy's fascist history.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

The Andean town where every single building is decorated with a brightly colored frieze.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The colonial city's social history is reflected in its fanciful door knockers.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

A dangling church built over a Colombian gorge.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.