One of the American Southwest's most extensive collections of Navajo rock art.

These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

The site of an underground detonation of a megaton nuclear bomb in the middle of the Mojave Desert.

These unusual rooms on wheels are holdovers from the 1960s.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The highest point in Virginia can only be reached by passing through ponies and flowers.

Outsider art meets paleontology at this roadside reptile repository.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

In the middle of a remote desert town is a surprisingly opulent hotel.

An Industrial Revolution-era public work that purified water using nothing but sand.

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

The rocks in this arid basin leave trails of movement behind them.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

The world's longest known cave system.

A monument celebrating the idea of reaching inaccessible places.