The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A historic covered bridge, only one of two remaining in North Carolina.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

The site of a tragic massacre that spawned a multimedia franchise.

This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

The highest point in Maryland is only accessible by hiking through another state.

Possibly the world's only drive-in movie theater with an attached motel.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The only retired U.S. nuclear missile silo that is open to the public.

A popular rock that acted as a waymarker for American pioneers.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

Eat burgers beneath gargantuan taxidermy and thousands of dollar bills in Utah's oldest continuously-operating bar.

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

This geothermal hot spring hides beneath a slowly growing mineral dome.

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

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

An acoustic anomaly with a mysterious cause.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.