Where beautiful signs live on forever.

This magnificent Cincinnati graveyard is also a popular public park.

Iconic red and white plaques show the creative names invented to navigate the city streets.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

This automated sculpture of two men peeing will spell out text messages with their micturition.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Macabre astrological automaton clock dating to the late 1400s.

Two stunning 17th-century libraries and a cabinet of curiosities.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Decades before the scandal, this staircase on the river was a literal "water gate."

Perhaps the most scandalous statue of America's first president.

The most accurate timepiece in the world.

The oldest continuously operating fish market in the United States.

There’s a hidden military meme engraved on the World War II Memorial.

The site of the climactic scene from the classic horror film is now a historic landmark.