13 Stunning U.S. National Monuments You Didn't Know You Needed To See

You know about the seven world wonders, and you know about U.S. national parks. But U.S. national monuments are a whole other class of beauty that, to be honest, we never realized was missing from our bucket lists.

President Theodore Roosevelt started the U.S. national monument program in 1906, when he chose Devil's Tower in Wyoming as the first. Presidents and Congress can establish sites of "historic, prehistoric or scientific significance" to join the list: Barack Obama named three new ones earlier this year. U.S. national monuments now number well over 140, including striking historic sites like a Maryland landscape dedicated to Harriet Tubman's Underground Railroad and dazzling natural wonders like the Grand Canyon.

Here are some of the most beautiful, little-known U.S. national monuments, just in time for a late summer road trip.

Vermilion Cliffs, Arizona
Fifis S. via Getty Images
Admiralty Island, Alaska
Kimberly Brotherman via Getty Images
Buck Island Reef, U.S. Virgin Islands
Getty Images
Misty Fjords, Alaska
Tom Bean via Getty Images
Sonoran Desert, Arizona
tonda via Getty Images
Virgin Islands Coral Reef, U.S. Virgin Islands
Steve Simonsen via Getty Images
San Juan Islands, Washington
Edmund Lowe Photography via Getty Images
White Sands, New Mexico
Grant Kaye via Getty Images
Cedar Breaks, Utah
Emily Riddell via Getty Images
John Day Fossil Beds, Oregon
Witold Skrypczak via Getty Images
Muir Woods, California
Jeffrey Schwartz via Getty Images
Castillo de San Marcos, Florida
Glowimages via Getty Images
Rainbow Bridge, Utah

Also on HuffPost:

Ten Best U.S. National Parks