Dedicated to one of the darkest moments in Irish history.

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

Narrowest house in Boston.

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

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

A 131-year-old wunderkammer of Texas history.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

New York's southernmost subway station is whimsically wavy.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

The home of the first American-born saint is one of the only curved buildings in New York.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This curious, round temple is the oldest still-standing marble building in Rome.

The underground sanctuary of a mysterious ancient cult.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

A town wears its heart on the sleeve of a smiling girl, arms flung wide open in a cheerful greeting for all who encounter her.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

An extraordinary final resting place full of oversized art, amazing statues, and dead celebrities.

Funded entirely by volunteers and donors this military memorial features a tank with a comedy line on its barrel.

This wooly sculpture supposedly marks the birthplace of a famous nursery rhyme, or not.