Breathtaking Byzantine paintings cover the inside of this 12th-century church.

The ornate miniature mansions were built for Istanbul's feathered residents.

The only recreation of William Shakespeare's indoor playhouse.

This old mill and former police station now present a world-class collection of Orthodox iconography.

America's "second most important bell" is a contentious spoil of the Civil War.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This unique museum doesn't shy away from highlighting Qatar's role in the history of slavery.

The final resting place of the famous Rhode Island lighthouse keeper who heroically saved dozens of people from drowning.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

The shallow, salty inlet was a safe haven for 19th-century pirates.

The enormous diamond-shaped building packs a trove of academic and literary treasures into one futuristic space.

An abandoned fishing village in pre-oil Qatar.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

This fortress sits atop a centuries-old well system.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

This giant volcanic crater holds its very own field of salt.

An archaeological site believed to be the burial place of the "mother of us all."

An annual two-week festival near the city of Riyadh when Saudis let their hair down.