Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

Two small chapels housed inside an ancient tree.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

The site of one of history's most indelible and horrific tragedies.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The final resting place of one of the United States's greatest poets.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

An extraordinary "City of Caves" carved from solid stone.

A building so large that it has its own weather.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

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

The final resting place to 300 Victorian-era pets hides inside the city park.

The stately remains of Llywelyn the Great's mighty fortress.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A subterranean playground in an abandoned slate mine.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Rippling sand dunes frozen in the Arizona rock.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

World's largest collection of serial killer artwork and other macabre exhibits.