The stunningly blue waters of these beautiful caves also have a violent past.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

The ruins of an ancient pyramid built by the mysterious Chupícuaro civilization.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

These ornate arches show how the course of the River Thames has changed.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

This network of narrow, medieval passages has the most delightful name.

A unique museum dedicated to the Gullah-Geechee people, housed within an old oyster cannery.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

The world’s first hotel to be run by robots.

The only Bahá'í house of worship in North America and one of only a handful worldwide.