It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

The largest and, arguably, most scenic fortress in Bhutan.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

The sunken structure looks like the victim of a catastrophic flood.

The weathered grave of a medieval anchoress who walled herself up in a cell attached to a church.

The beloved fantasy novelist is buried near a church containing a whimsical etched glass window full of Narnia favorites.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

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

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Ancient rock-cut tomb? Definitely. That of a great Median king? Unlikely.

Gorgeous purple flowers drape from the world's largest blossoming plant.

This former iron ore mine comes alive with fascinating stories of its history.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

Cherry blossom season comes early in this Japanese town where pink flowers line the streets and riverbanks.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

The beloved dining spot stands at the cross-section of Hollywood and the Old West.

There's an exclusive Beefeaters pub hidden in the Tower of London.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.