A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

An alchemist's "magic door" stands in the middle of a Roman park.

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

Home of the "true" equator.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The mark of the Devil's horns on a marble column in Milan.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The Hanshin Expressway goes right through its 5th, 6th, and 7th floors.

This neighborhood thoroughfare is haunted by dozens of homemade monsters.

The 10,000 Torii shrine.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This Buddhist temple is home to the graves of the Japanese national legends, the 47 Ronin.

The world's largest piece of copyrighted artwork.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

This funeral home had the honor, if that is the correct word, of hosting the funeral of the famous Sacco and Vanzetti.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

This popular Boston haunt is reminiscent of a time gone by, when slow cafes and sweet-smelling smoke wafting from patios was the norm.