This unusual building straddles two countries.

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

One car at a time please.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This World's Fair showpiece was built in Chicago, but shipped to Maine.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

A monument marks the beginning of the longest north-south road in the United States.

This candy-striped tower is the farthest east you can go in the United States.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

This former factory has been transformed into a technicolor wonderland, where dozens of local artists have collaborated to create a real choose-your-own-adventure experience.

This grand Spanish-Cuban restaurant has been serving customers for more than a century.

This concrete sculpture features a woman opening her heart to showcase a beautiful fern.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Florida castle built with aluminum printing plates.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

A hidden beach at the end of a tunnel of mangrove trees.

Stay in a room with a view... of the bottom of the ocean.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.