A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The world's biggest floating museum in Gothenburg, Sweden.

Pagan monument converted to Christianity with the population.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

A quiet memorial to those who died saving others in the heart of the City of London.

World's largest crossword puzzle spans the side of a towerblock, its clues scattered throughout the city.

Mediterranean castle on a tiny Turkish island.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

Where the lovelorn find a home for their sentimental keepsakes.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Former villa and estate of James Deering developed to preserve native tropical forests.

Eastern Canada's ocean playground.

A whimsical, but often overlooked clock in Park Avenue.

A shipwreck named Desire at the shore of Batumi.

Charles Babbage's proto-computer, painstakingly brought to life.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

A Spanish town built into the cliffs.