This lighthouse has been guiding shipping into the Golden Gate since before the American Civil War.

An enchanting tunnel of cypress trees leads to an old morse code station still used today.

A psychedelic tribute to one of Georgia's most unique artistic visionaries, out of place and time in the heart of Atlanta.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This stone tower was built to protect Crete from incoming pirates.

An air of mystery pervades this modern-day singing Stonehenge.

A mammoth WWII anti-air defense tower has been repurposed as a hotel with a rooftop garden.

Hidden in plain sight on a gable between two towers on the roof of shipping firm F. Laeisz' headquarter in Hamburg sits an unexpected bronze sculpture.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

This mountainside mural of a person carrying a torch was created for the 1994 Winter Olympics.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Where a neoclassical sculptor rests at the heart of the museum devoted to him.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

Thousands of miniature bronze sculptures have taken over this city square creating a unique art installation.

This unlikely 1980s relic at a bus station recalls the New York real estate tycoon before his political career.