This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

A chapel on a volcanic core, marking the end of a successful journey.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

Cozy basement bar sports an inventory of over 2,000 beers.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Five candy-colored villages on the Italian Riviera.

Go inside to really appreciate this 500-year-old technological masterpiece.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

2300-year-old Roman road connecting the empire.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This impressive Boston holy house is the American mecca for Christian scientists.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A beautiful but toxic fountain of mercury.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A French museum of wrought iron.

The man who introduced reinforced concrete to the world demonstrated its genius by using it to build his own house.

An ancient ossuary in Rouen.