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

This elaborate towering structure was once famed for its revolutionary height.

A huge boat-shaped hotel with a blood red pool and other oddities.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

A graffiti Mecca welcoming artists from around the world.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

New York's southernmost subway station is whimsically wavy.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

The famed amusement district marks the beginning of summer with a wild procession of nautical creatures.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.