Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Used as a military post in three different engagements, this fort has remained incomplete and unfired upon for nearly 200 years.

How did a 154-foot-long piece of spacecraft wind up abandoned along the side of a Florida road?

The second oldest jail in Florida gives insight into the realities of the criminal justice system at the turn of the 20th century.

The longtime home of author Stetson Kennedy, this park counts Woody Guthrie as a former resident.

Remarkably realistic Florida shoal bass "swim" inside this large globoid sculpture.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

A small Richmond island dotted with the remnants of hundreds of years of history.

An abandoned munitions storage facility with a rich architectural history.

This twisty sign depicts the chain's first logo.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

A stone marker commemorating the first time sound was transmitted over wires.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Dedicated to a colonial woman who was hanged for being a Quaker.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Two thousand artifacts from around the world collected by one woman who loved to travel.

The Boston square dedicated to the dark poet who was born nearby.

Ice cream stand, snack bar, and time capsule of milk conveyance.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

The lecture hall where Alexander Graham Bell first demonstrated the long-distance phone call.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."