This coastal rock formation resembles a churning cauldron at high tide.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

Old submarine parts have been converted into faux whale fins.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

A burial ground for workers at one of Hawai'i's largest sugarcane producers that laid buried for decades.

This blowhole is supposedly caused by a trapped monster.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

This former luxury resort in Kaua'i is now an abandoned relic.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The national park was once a plantation estate.

The romance of early commercial flight still fills this Art Deco destination.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A building shaped like the Army Corps of Engineers logo, because why not?

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This abandoned bootleg attraction was built to cash in on the popularity of classic TV show, F Troop.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Former villa and estate of James Deering developed to preserve native tropical forests.

The timeworn "Yankee Stadium" of the fastest game in the world isn't going anywhere.

This shop also boasts some sweet memorabilia from "Willy Wonka and the Chocolate Factory."