An Adirondacks museum housed in the former studio of Marcella Sembrich, the 19th century opera star most famous for her role of Mimi in "La Boheme."

A mysterious echo seems to defy the laws of acoustics.

An acoustic anomaly with a mysterious cause.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

Robots, lasers, and whoopee cushions, oh my!

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

For more than 15 years, this downtown dive bar has hosted fiery outdoor “iron pours.”

This lookout tower built in the 1930s is now an in-demand cabin with what might be the best view of the Seneca State Forest.

This former fire tower is now a rustic observatory that offers amazing views of eagles, hawks, and the Appalachian Mountains.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

This traditional garden in the San Fernando Valley doubled for Star Fleet Academy, and is irrigated entirely by wastewater.

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

The quiet canyon has a tumultuous history involving a doomsday cult.

A common entry point to the Griffith Observatory trail holds its own wonders.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

An off-the-beaten path cave with an underground lake.

When waves crash onto this section of beach, the rocks sing a song.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

An unexpected sinkhole in a desert flat within Gold Butte National Monument.

Once luxurious, these oceanfront beach homes have been left to succumb to the elements as the beach is slowly washed away.

This natural spring not only claims to heal the wounded but it has also been willed to God.

The sole remaining outpost of a once-thriving South Carolina chain still sells “pic-a-nic” baskets.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.