100-year-old shipwreck you can walk up to at low tide.

Yo, Adrian!

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

The longest covered bridge in Delaware.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

10,000 flowered plants bloom in the City of Roses.

This legendary urban waterfall creates a dazzling display of rainbows.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The ghostly remains of an accidental sea.

A giant knight, sex education, date shakes, and Jesus coexist happily in this Coachella Valley desert oasis.

The highest point in Washington state is a volcano covered in glaciers.

An eclectic collection of wind-powered sculptures made from found and recycled materials.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

Boats and fish both find their way through this massive hydroelectric structure.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This park straddling the United States-Canadian border has been a symbol of peace since 1932.

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

A monument to the center of the North American continent may be off by a few miles.

One North Dakota man's vast collection of rare rocks, polished orbs, and geological wonders.

Wally is the 26-foot-long fiberglass emissary for Garrison, North Dakota, one of the self-proclaimed (and hotly contested) Walleye Capitals of the World.

Oregon's unexpected high desert, displaying layers of time in a colorful show.