This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

Odd stone and concrete monuments in the "Poet of the Sierras" eclectic folly garden.

This railroad tunnel was once the longest in Massachusetts.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

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

Walk the same tracks that once ferried Gilded Age aristocrats to their vacation destinations.

Fire meets ice at the southernmost volcano on Earth.

This attraction was abandoned after the Chernobyl disaster.

The ruins of the castle that chemicals built.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

The home of one of California's most important horticulturalists wilts amidst a lovely park.

A clear blue swimming hole with hidden caves, still unexplored.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

The second tallest railway trestle bridge in America.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Continuing a tradition of movie magic on the site of America’s oldest continually operating movie theatre.

A 1,000 pound brass bell commemorates a time when this small maritime neighborhood was actually its own separate city.

A Boeing mechanic and his wife leave a whimsical, stone sculptured garden as their legacy.

A massive sea stack famous for its appearance in The Goonies.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

The remains of a former logging boom town, crumbled away in the forest.

Despite being dead since the 1970s, this Canadian tree is kept upright and intact by adoring locals.