The commemorative stone column conceals a secret laboratory.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

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

This Indianapolis landmark offers a secret panoramic view of the city. 

On the grounds of this study, Lew Wallace composed "Ben-Hur: A Tale of the Christ" and many other works.

This unusual building straddles two countries.

A serene plaza that commemorates one of the Granite State's most iconic figures.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Dispersed across 45-acres, 39 structures house a massive collection celebrating American Folk Art.

This rare polygonal meeting house is rumored to be built in a circle so that the devil has nowhere to hide.

Vermont's hills are alive with the sound of music at this historic hotel.

This large cemetery is known as the museum of granite sculptures.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This floating sculpture of ice is a poignant reminder of nature's power.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

An artist's mausoleum with a haunting echo.

This handsomely carved wooden church is more than 800 years old.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

Illegal drag racing two stories beneath Chicago’s streets.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

The first artificial white water river course in North America cuts right through an Indiana city.

This museum collects over a century of automobile history including the iconic car from The Muppet Movie.

The Grand Canyon of Texas.