This secluded walking trail is a hidden gem of a Pittsburgh park.

Hundreds of antiquated typewriters and office machinery show the technological evolution of business.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

Romania's triumphal arch looks out over Bucharest.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

A lush indoor jungle fills this bustling Madrid transportation hub.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

An Irish Memorial commemorating those who perished due to potato blight.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

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

World's first "penitentiary," meant to be humane, drove men insane.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

A single light illuminates one man's overshadowed contributions to street lamp history.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

Oldest synagogue in the United States.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

A former waterfront market is now in the center of town due to some interesting Boston engineering.