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

The ancient latrines of the Greeks, in all their public glory.

This famous city eluded concrete detection until the early 2000's.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This giant sculpture made of trash is a critique of society's wastefulness.

Elaborate tile work in this railway station tells the story of Portugal.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

The stunning interior of this Gothic church is covered in ornate gold details.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Send a postcard while vacationing with Satan.

Khmer Rouge's high security prison.

One of the biggest markets in Asia, under one of the continent's largest domes.

Hoax, mistake, or evidence of dinosaurs in human times?

5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

One man's love for East Coast diner culture brought an entire eatery all the way from New Jersey to Colorado.