Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Now nearly abandoned, Kaskaskia was once the capital of Illinois and one of the most important towns on the upper Mississippi.

Once a giant oak that served as the region's post office.

The largest riverfront opening cave in the Ozarks.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

A 20-foot-tall egg painted in a traditional Czech patterns by the Czech community in Wilson, Kansas.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

The longest of the four remaining covered bridges in Missouri.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

A historic, scenic mill that was forced to close due to overlogging.

Often referred to as the largest spring in America.

A natural swimming hole that was once a ceremonial center for Mayan priests.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

A busy island at the center of the world that doesn’t actually exist.

This sculpture may be the only known depiction of a man who helped finance the American Revolution and inadvertently created the dollar sign.

This monumental work of art symbolizes the coming together of a previously divided city.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

An experimental, automotive replica of Stonehenge.