This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This memorial includes fragments from one of the greatest tragedies in United States history.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

Ancient pueblos built into the base of a natural canyon wall.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

This sparsely populated town offers a look back in time.

A little slice of Florida face-in-a-hole kitsch, unexpectedly located in a small New Mexico town.

The oldest continuously occupied public building in the United States.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Go take a picture with the inventor of the daguerreotype photographic process.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

A building shaped like the Army Corps of Engineers logo, because why not?

This forgotten boat elevator was an engineering marvel in its heyday.

The span is crooked and made from two older recycled bridges.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

This outsider art paradise is filled with dinosaur sculptures crafted from recycled machinery.