The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

This exquisite example of early colonial architecture remains unfinished almost 500 years after construction began.

The surviving remnants of a destroyed medieval church now stand in a public park.

A mysterious ruin shrouded in more folklore than fact.

These ruins of Francis Bacon's once-magnificent manor are hidden in the English countryside.

A little-known park with unusual, half-ruined structures and a mystical energy.

The oldest surviving mosque in the UAE has mysterious origins and unusual architecture.