Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

The first and only carousel with a lineup entirely of insects.

A riverfront park that both remediated and preserved its industrial past.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This theater opened in 1998, but both the building and the puppeteers who perform there have a distinguished history.

Rare moles meet activism at this Oaxacan eatery.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

The famous author's cottage hideaway.

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

This old estate is a remnant of when the Bronx was a popular summer destination for wealthy New Yorkers.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

The location along the shores of the Great Salt Lake of what was once called, "The Coney Island of the West", now sits barren due to arson and time.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Come for the speed, leave in love with the desert.

What began as a prominent Burning Man art piece is now an iconic symbol of downtown Reno.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.