The walls of the iconic dome are hollow and have a secret stairway.

Home to items never before seen by the public.

A controversial memorial at the place where Captain Cook met his violent end.

This blowhole is supposedly caused by a trapped monster.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

This black shoreline is made up of exploded lava particles.

An abandoned stretch of highway, deteriorating next to the operational one.

A curious blend of taxidermy, antique tools, creationism, and a purported antediluvian rock.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

The oldest farmer's market in America is so ancient it was approved by the King of England.

One New Hampshire alleyway has become home to a public gallery of feline art.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A mailbox that saved a nature reserve.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

One of the last active volcanoes on the Eastern seaboard.

America's post-nuclear-attack chambers of Congress.

Unique tower has outlasted a takeover of the company.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

World's largest collection of Coke-related items not held by the Coca-Cola company.