"A hideous albatross in the Hudson River Valley."

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

The Hudson River School comes alive at this palatial estate.

The oldest continuously inhabited street in America.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

The world's brightest bioluminescent bay.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The fifth-longest natural arch in the world, and the longest outside China.

It's safe—and permitted—to walk across these twin natural sandstone arches.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

The highest point in Connecticut was incorrectly memorialized before surveyors discovered the actual spot.

The site of the first "historically true" UFO encounter in the U.S.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

Memorial to the father of the Republic of China.

The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

Historical figures from New York City's Catholic community reside in Midtown.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Golden Gate Park's historic collection of plants.