Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

The television series' iconic giant foot was borrowed from this classical painting.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This coffee shop lies hidden beneath a historic church.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

This historic national park is covered in the stunning ruins of red rock pueblos.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

An artificial crater field that trained astronauts for lunar exploration.

This 1930s log cabin began as a taxidermy museum but is now a popular country music venue.

An important piece of history from mankind's journey to the moon sits in the lobby of a government science lab.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

A replica of the flagpole that gave a frontier town its name.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

Take a monster truck tour around an ostrich farm in the middle of the desert.

A spiritual vortex among the red rocks in Sedona.

This collection of vintage signs reflects the long and colorful history of this Arizona town.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.