A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

This memorial honors those who served on Gallops Island Radio Training Station during the second World War.

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

It houses the remains of a 17th-century version of the Titanic.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Scene of the grisly murder of two Norwegian women in 1873.

This picturesque abandoned home is rumored to be a spite house.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

Friction between grains of sand cause a curious "singing" sound.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

An eccentric inventor's castle home with its own indoor weather system.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

Cliffs that hold fossils, including the earliest known reptile, dating back more than 300 million years.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

Copenhagen's celebrated theme park and gardens.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Micro-nation based around a nine-story high illegally built tower.

Old Danish castle immortalized in Shakespeare's Hamlet.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.