Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Elevated freight railway turned wildly successful urban park.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Go inside to really appreciate this 500-year-old technological masterpiece.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This one-time health resort was used by aristocrats around the world.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The largest greenhouse in the world is home to over one million types of plants.

Giant topiary dog once played a role in a terrorist bomb plot.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

A colorful square marks the heart of the city's LGBTQ community.