Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The unfinished final resting place of some of Spain's most prominent politicians.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

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

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

It’s said this crypt was the setting for the tragic finale of the Shakespeare play.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

One of the indelible moments of the American Revolution took place at this location.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

This ambitious father and son team reigned supreme over the North End, and witches, for many years.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

Painstakingly built dioramas sit unnoticed in a Boston office building.

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Dim sum, served in a grand old theater.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The Boston square dedicated to the dark poet who was born nearby.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.