You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

One of Cincinnati's greatest fighters once trained at a now defunct gym in this Over-The-Rhine neighborhood.

The largest ancient burial mound in Ohio.

Inside, ancient treasures. Outside, modern contradictions.

This magnificent Cincinnati graveyard is also a popular public park.

Where beautiful signs live on forever.

This collection of Japanese luck idols beckons visitors with over 2,000 waving paws.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

Noirish green neon marks the location of one of the oldest private detective agencies in France.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

Notorious artist squat renovated into legal studios.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

An abandoned asylum incorporated into a college campus.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.