It might not be as impossible to reach as its name would imply, but just about.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

Traveling collection of amazing automata.

A tongue-in-cheek arcade where the games are based on everyday life.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A kaleidoscopic warehouse-maze of handmade neon signs.

Its collection includes a broad array of social, geographic, graphic design, and political history.

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Remnants of a Victorian garden feature sitting in public woodland.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

These spartan apartments are provided to clergymen visiting Vatican City.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

A hidden workshop for creating and restoring Papal mosaic masterpieces.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

Breathtaking and huge 430 year old maps of Italy.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

An abandoned monastery sits on a far-off island in the Adriatic Sea.

A unique interactive experience of everyday life in communist Yugoslavia—a very different time in Croatian history.

Maine's oldest diner also happens to win acclaim for its elevated comfort food.

This colorful theme park dedicated the official fruit of Maine serves sweet, tasty treats.