The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

The world's largest fully steerable radio telescope.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

America's post-nuclear-attack chambers of Congress.

One street divides a single town that stands in two U.S. states.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The drama of nature in full effect in this Nevada State Park.

Experience a charming 1930's version of "infotainment."

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

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

An architect's childhood fantasy treehouse made real.

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

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

A beautiful geyser under environmental threat.

The only road through the heart of Glacier National Park.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A small granite block at this monument's base is the only part of Lincoln's Tomb outside of Illinois.

Where the oil industry began.