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Tourists flock to the buoy (Flickr/Turtle43)
Key West, Florida

Southernmost Point of the Continental U.S.

A monument celebrating the idea of reaching inaccessible places.
24.5465, -81.7975
Homestead, Florida

Ed Leedskalnin's Coral Castle

A mysterious castle built as a monument to lost love.
25.5005, -80.4446
Devil's Slide Bunker
Pacifica, California

Devil's Slide Bunker

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.
37.5744, -122.5203
San Francisco, California

Palace of Fine Arts

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.
37.8029, -122.4482
The Chandelier Tree in 2005.
Leggett, California

Chandelier Tree

Massive redwood tree that has a hole in the base big enough to drive through.
39.8657, -123.7142
Avenue of the Giants
Redcrest, California

Avenue of the Giants

One of the most scenic stretches of road in America winds between some of the country's oldest trees.
40.3682, -123.9296
View of the ruins from the hillside. The original stairs would have come down on the far left. The curved edge of the original aquarium and the outline of the diving well are on the right.
San Francisco, California

Ruins of the Sutro Baths

The seawater playground of gilded-era San Francisco burned to the ground in 1966.
37.7799, -122.5137
Main entrance to the Exploratorium at Pier 15
San Francisco, California

Exploratorium

San Francisco's newly reopened hands-on science museum.
37.8017, -122.3973
A place to sit and admire the sea.
Thermal, California

Salton Sea

The ghostly remains of an accidental sea.
33.2987, -115.9561
A small group stands as close as they dare
Pāhoa, Hawaii

Big Island Lava Flow

Watch the newest land on the planet form before your eyes.
19.3956, -154.9331
Crater Parking Lot, Mountain in the Distance 2007
Winslow, Arizona

Meteor Crater

This 4,000-ft. in diameter hole claims to be "the most well known, best preserved meteorite crater on Earth."
35.0281, -111.0232
Phoenix, Arizona

Mystery Castle

A self-built castle made by a mysterious man.
33.3568, -112.0619
Tumbleweed Christmas Tree
Chandler, Arizona

Tumbleweed Christmas Tree

Every Christmas one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.
33.3038, -111.8421
Casa Grande Ruins
Coolidge, Arizona

Casa Grande Ruins

Some of the tallest ancient American ruins continue to inspire awe and curiosity.
32.9778, -111.5176