The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Old Danish castle immortalized in Shakespeare's Hamlet.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

Climb to the top of the world's largest seated bronze Buddha.

This peaceful, round shrine in the middle of the Sri Lankan jungle acts as a beacon of peace.

An ancient stone fortress considered by many to be the eighth wonder of the world.

A battle between nature and architecture in the Cambodian jungle.

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

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

For centuries young Thai men used this Giant Swing as a slingshot to heaven.