Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

This hidden collection of everyday objects illustrates life within communist Poland.

Brought to you by the makers of fiberglass dinosaurs.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This man-made mound monument was built out of soil from all across the Polish empire.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

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

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.