The vaulted ceiling is home to a scurry of “squirrelgoyles.”

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

This high desert botanical garden is a unique display of New Mexico’s ecology and culture.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

This unassuming passageway played a key role in one of the most important events in U.S. history.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

The 28,000-year-old specimen is remarkably intact.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

A stone pillar commemorates the surrender of the extraordinary Apache leader.

Two creeks flow out of either end of this canyon in opposite directions.

A river runs through this remote valley in a very unexpected way.

These lush groves of fan palms rise up like oases out of southern California's Colorado Desert.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

Once a year, at exactly 11:11 a.m., this monument comes to life.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The ghost town that ended up on Ebay.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

An old California photo stand has been turned into a shrine to the cozy art of crochet.