A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

With a crest near 10,000 feet, this treeless fault-block mountain in eastern Oregon provides stunning views and spectacular glacial landforms.

A home that witnessed Civil War combat on the Sunken Road has the battle scars to prove it.

In the Scottish Highlands, this 13th-century castle ruin is hidden at the end of a farm track.

A small part of Russia that does not touch any other part of Russia.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

A monument to the legacy of the man who created Spongebob Squarepants at the school where his passion for art and marine biology began.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

Burial mounds of prehistoric Native Americans who lived along the DuPage River.

World's second largest particle accelerator, where nature reveals its secrets.

An exhibit of items from the mental institution where Mary Todd Lincoln lived after her son conspired to have her committed.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

This house renovated by Frank Lloyd Wright was the centerpiece of a lavish 20th-century estate.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

This cemetery is all that remains of a school for "wayward" girls.

A hidden grotto on the grounds of the Kane County Government Center.

Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.

In 1977, wealthy socialite Sandra West was buried wearing an elegant white nightdress while reclining comfortably in her powder-blue 1964 Ferrari.

The forgotten remnants of a land-to-sea cable car that was once unique in the world.

Also known as "Leicester's Folly," this almost cathedral was left unfinished and in ruins.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

This former farm In northern Iceland is now a museum, where visitors can tour beautifully-preserved turf houses.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.