"X" marks the spot of an echo chamber in the middle of a plaza.

This stone is a marker of one millionaire's personal vendetta against gravity.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

Developers built a Walmart around one family's plot and constructed a mausoleum in the parking lot.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

Healing Springs that once ran red with soldiers' blood.

Bad farming practices caused this unnatural natural wonder.

This quirky curiosity shop takes its cues from the world's bazaars.

The mysterious round rocks of Schooner Gulch.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A multimedia experience that chronicles the atrocities of racism.

New fungal and bacterial species call this deadly lake home.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

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

Deep scars on the earth left by the Ice Age.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

A former electrical substation is now home to an eccentric junk art masterpiece.