Known as the Casa de las Siete Chimeneas, this haunted 16th-century manor has a dark, mysterious past.

Dedicated to a young woman who broke gender barriers at the University of Madrid.

Founded as a refugee camp, now a popular tourist spot.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

A sign marks where the two bodies of water meet.

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

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

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

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

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

The "Seinfeld" diner.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Peek through the gates at this oasis from the city, full of Old English charm.

A playground the size of a city block is a modernist monument to civic values and public housing.

This diesel train serviced the Brooklyn waterfront for more than three decades.

Hiroshima survivor on Riverside Drive.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

This Upper East Side apartment co-op was designed as a tuberculosis sanitarium.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."