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.

Dr Barnes' $25 billion private collection of art and arboretum.

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

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

Yo, Adrian!

One of the oldest surviving Swedish-American homes in the United States.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

These lush botanical gardens employ the most purrfect pest control force.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

This one-room cabin where the young colonel slept during the French and Indian War.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

The grave of a champion Thoroughbred hides within the former presidential estate.

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

A monument marks the location of the first successful steamboat demonstration.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

A collection of artifacts from Maryland's maritime past.