The air force base preserves its scars from the Japanese attack on Pearl Harbor.

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

Get up close and personal with these majestic fish.

Football field-sized microalgae production tanks on the Hawaiian coast create a stunning view from space.

This unusual lava tube spouts seawater during high surf.

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.

This legendary urban waterfall creates a dazzling display of rainbows.

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

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

America's first public mental health facility.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

Time travel with sweets across history at this research-based candy store.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

Race through the maze, get your name on the sign.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

A unique set of caves that spits waves back out into the ocean.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.