San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Quite simply the largest tree in the world (by volume).

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A commemoration of over 150 of St. Louis's favorite sons and daughters.

Hundreds of graffiti artists have decorated this flood-wall on the west bank of the Mississippi River.

From a canyon-like gorge, more than 20 million gallons of water emerge every day, while a smaller spring drips down, creating the illusion of an endless, gentle waterfall.

Some of the oldest exposed rock formations in the United States.

Rusted and decayed, this former mining site is a portal to the past.

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

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

When he found his hometown was no more, Lowell Davis decided to recreate a "new" ghost town from scratch.

An abandoned factory along the Mississippi coated by a giant mural.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

This historic cliffside mansion uses a natural cave for air conditioning.

A kitschy, creepy St. Louis mainstay.

Giant granite rocks standing end-to-end like a train of circus elephants.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

Erosion and time have created a naturally-formed water park.