Largest man-made excavation on earth!

Visitors to this library are in for a real-world education in modernist architecture.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Ancient catacombs form the foundation for this Rococo orgy of a church.

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

This small chapel is built of human bones and decorated with a golden skeleton.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Houses are tucked between, on, and underneath giant boulders.

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

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A shining, cold, black organ lies in San Francisco's financial district.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

A miniature view of the park, caught in time.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

Recovered from the brink of extinction, at home in the Financial District.

A psychedelic labyrinth on the San Francisco bay.