A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Architectureal fantasy quarter of Rome.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Ruins of a German Castle on top of a towering stone pillar.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

Try not to get slimed in Tribeca.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

One part local history, 99 parts gruesome haunted house.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A seemingly endless landscape of pure salt stretches far across Bolivia.

A museum in a law office, filled with authentic and counterfeit goods.

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

A gateway to a mysterious network of underground tunnels.

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.