This former sugarcane transport tunnel is now a portal to a lovely beach.

The world's second largest single-dish radio telescope, once used to contact E.T.

The highest peak in Puerto Rico is home to a rare fern that can only be found on six trees at its summit.

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

The final resting place of New England's last "vampire."

An architecturally unique lighthouse that had to be lifted up and moved to avoid falling in the sea.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

A mysterious air force base built to resemble a Long Island fishing village.

This backwater graveyard in the Hamptons became a trendy burial spot and posthumous status symbol for famous artists.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

The graves of a Connecticut family thought to have been plagued by a vampire.

A large camera obscura, constructed entirely from digitally fabricated components.

This private island is still in the family after a 400-year history including a witch hunt and a pirate.

The Connecticut village named for its subterranean thunder.

Etchings in a pile of boulders on the Long Island Sound are a monument to vanquished native peoples.

One of America's first spies started out as a teacher in this little red one-room schoolhouse.

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.

House used in the 1971 horror film "Let's Scare Jessica to Death."