Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This small fort played a huge role defending Puerto Rico’s capital city.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Ruins from the Parthenon and petrified wood line the interior of one of the world's most famous monuments.

The world's largest public collection of PEZ memorabilia.

The beautiful behemoth is one of the largest trees of its kind in the United States.

For over 20 years, Lil Toot has delighted guests with narrated boat rides between Stearns Wharf and Santa Barbara Harbor, becoming a beloved local legend and top-rated experience for visitors.

A second generation sun-powered marvel lights up the night.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

Take a dip in the world's largest mineral hot springs pool.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

There are eight natural springs around town, each with a slightly different taste.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This hidden treasure is the world’s oldest active geocache.