A memorial to an ill-fated Holy Land mission once described by Mark Twain as “a complete fiasco.”

The largest wooden building in the world now houses a fascinating collection of aircraft.

A Roman-style column in Oregon hides a spiral staircase inside.

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

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

This Great Depression-era creation was once known as the strangest house in the world.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Rising out of a clearing in New Jersey's Pine Barrens is an Aztec-inspired monument to the "Lindbergh of Mexico."

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

The third-tallest lighthouse in the United States stands as a reminder of Atlantic City's early days.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Come for the Italian food, stay for the taxidermy and giant statues.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

At this airport "microcinema," you can catch a film before you catch a flight.

Tiny horses tethered to antique rings are scattered around the city.

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

The rusting remains are visible sticking out of the waters of the Delaware Bay.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.