This sculpture pays homage to the street sweepers of Madrid since its inauguration in 2001 in Plaza Jacinto Benavente.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A haven for book enthusiasts across the street from Retiro Park.

A statue commemorating a beloved stray dog who was adopted by the entire neighborhood where he lived.

An old, deep well, connected with a miraculous, divine rescue and the patron saint of Madrid.

This girder was hit by a bomb during the Spanish Civil War, but nobody knew about it until 2016.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

This little sun pays homage to a massive gate that once stood at this location.

Automatons that were once removed after one fell from the building.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

A mysterious stone embedded at the base of a historic Boston building.

This historic patch of real estate offers a glimpse of colonial Boston.

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

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

Two thousand artifacts from around the world collected by one woman who loved to travel.

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

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

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

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

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

This landmark cemetery in Boston was created more than 300 years ago.

Historic Hull Street was actually the first street with a proper name in the Boston area.