A regular looking rock with an unbelievable history.

An underground city of salt.

Ottoman-era houses lovingly preserved.

Naturally protected city carved from a rock face.

This historic tower in the California desert promises visitors a "vortex of good vibes".

All of Thailand's architectural landmarks, plus some made up ones, all viewable via two-seater bicycle.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

Modest by day, illuminated majestically at sunset.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Shattered columns and Egyptian pyramids outside of Paris.

An Indonesian mosque styled after St. Basil's Cathedral.