The 10-foot-wide Long Beach home was built on a dare.

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.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

This stately bank building hides a spectacular star-studded ceiling.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

This sculpture of disembodied body parts forms a poignant memory of the horrors of World War II.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

The location where the iconic movie character declared it was time to go home.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A sharp bend in a dramatic river canyon cut through red rocks.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Sit at the "Disney table,” where Walt and his team of "imagineers" once dined on the regular.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.