At the time of its completion, it was the tallest dam in the world.

This colorful gate stands as an entrance to the walled city of Old San Juan.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

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

Yo, Adrian!

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

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

This two-room shotgun shack in Tupelo is the birthplace of a King.

Look closely and you’ll notice that the color changes a third of the way up the tower.

You can get anything you want at the former site of the restaurant immortalized by Arlo Guthrie.

This Gothic castle was inspired by Erik the Red's Viking residence at Brattahlid in Greenland.

Plymouth's huge yet little-known memorial to the Pilgrims.

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

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

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This memorial to a horrific ship collision sits over a mass grave holding dozens of the victims.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.