One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

The last water-powered beam pumping engine in Britain.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A winding, cliffside stretch of road overlooking the Delaware River.

These were the largest wind chimes in the world when artist Tom Van Sant created them for a California mall in 1967.

This popular pitstop lives up to its name.

Founded in 1880, this humble brewery still practices a disappearing technique of sake-making.

Stretching for 22 miles, the world's longest tree-lined avenue dates back to the early 17th-century.

The largest collection of model trains in the world is actually run using full-size locomotive technology.

This historical theme park celebrates all things noodle.

A semi-abandoned replica of Prince Edward Island's Avonlea—in Japan.

This cavern was used as a hidden hospital and safe house during the Vietnam War.

This Art Deco airport was once deemed “the air hub of the Americas.”

An abandoned marine theme park has created a difficult experiment in dolphin rewilding.

There's an exclusive Beefeaters pub hidden in the Tower of London.

This unique architectural wonder is home to luxury apartments.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Eritrea's futuristic gas station is a nod to Italy's fascist history.

Take a ride back in time with a steam locomotive trip through Eritrea’s mountainous countryside.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The smallest pub in Britain was once a cabinet of curiosities and it still has the dead cat to prove it.

A hidden three-foot-wide house separates these two regal churches.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

A shockingly detailed small scale recreation of the temples of Abu Simbel.