This small chapel is built of human bones and decorated with a golden skeleton.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

The world's oldest bookshop still in operation.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

One of the most exquisite Lycian hilltop citadels in Turkey.

A massive cave once a secret military base is now home to thousands of bats.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

UNESCO-protected ancient burial ground.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

A collection of art from Bulgaria's time as a communist state.