The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

At 207 feet, one of the world's longest continuous escalators.

An Aladdin's cave of old Silicon Valley tech.

A giant chess set, minus the psychedelic drug trip.

An extensive collection of ancient Egyptian artifacts and mummies.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A Biblically notable site over the ruins of an ancient city that is now a protected World Heritage site.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Guns that have been defending San Francisco since 1904.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

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

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

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

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

This might just be the TARDIS of bookstores.

Sniff the Titan Arum's rotting flesh.

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

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.

On holy holidays, Israel's second president used this room atop Mount Zion as a refuge to read the Torah.

The mosaic floor of a 4th-century synagogue features a pagan zodiac wheel alongside traditional images of a Torah ark and menorahs.

A magical oasis in the middle of the Negev Desert.