A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

A set of tall pillars and alcove-like rooms that are significant to the Miami people of Indiana.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

Get up close to an F-4 Phantom flown in the Vietnam War at this Florida park.

One of Indiana's only natural sandstone arches is nestled between resort ruins and an old Boy Scouts camp.

A life-sized recreation of the megafauna that once roamed this region is a feature at the birthplace of American paleontology.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Rare recess caves fill this unbelievably beautiful Ohio park.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

The empty tomb that houses the memories of Roy Bertelli's revenge.

The multinational Burger King chain is banned from operating within 20 miles of a family restaurant filed under the same name.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Just a man taking his prehistoric pet for a stroll.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

A replica of the first public theater built in California.