This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Where America's first doomsday cult awaited the end of the world.

It wouldn't be long after purchasing this farm, Brown would lead his siege on Harper's Ferry.

An unusual and eclectic collection of local historical memorabilia.

An exotic wildlife habitat right off The Strip.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

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

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

These medicine cabinet staples are part of the museum's collection of everyday objects.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

This unique creation was made by the largest manufacturer of Christmas bulbs in 1946 to honor those returning from World War II.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

The tombstone of the founder of the lost town of Ogletown is now stuck inside a traffic median.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.

In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.