The failure of one component toppled this entire bridge during rush hour.

Home to several unusual artifacts, including a huge painting of George Washington.

One of the few places where you can explore a 1918 paddlewheel steamboat from stem to stern.

Visit a replica of the estate where Aaron Burr allegedly plotted a treasonous scheme against the United States.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

Rare recess caves fill this unbelievably beautiful Ohio park.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A monument marks the location of the first successful steamboat demonstration.

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

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

The world's largest fully steerable radio telescope.

One of the last few period-correct, hand-operated canal locks in the country.

An office built to look like a giant basket.

An abandoned relic of the city's failed experiment with below ground transit.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

This Mediterranean castle was built for a millionaire and his giant dog.

An art deco ice cream shop covered in vintage train station tiles.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

The only diamond mine in the world where you can keep what you find.