This giant geoglyph of mysterious origins is now the site of neo-pagan rituals.

Decrepit Victorian public lift is a white-knuckle ride.

A vintage penny arcade hidden in the back of a fun fair-themed bar.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

A motley, fantastical agglomeration of unlikely houseboats along the Shoreham-by-Sea riverbank.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

The ancient tomb acts as a calendar that keeps perfect time.

3D war panorama in Damascus built with help from North Korea.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

The Syrian headquarters of alleged hashish-smoking assassins.

Ruins of the Crusaders' headquarters.

Mysterious lost empire of the Silk Road.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

A modern temple with an ancient philosophy.

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

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Elevated freight railway turned wildly successful urban park.

It houses the remains of a 17th-century version of the Titanic.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.

Flamboyant architecture from the turn of 20th century.