If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

Antarctica's bustling metropolis, originally established by Richard E. Byrd.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

A morbid piece of memorabilia from the most famous shipwreck in current history is just one of the many poignant artifacts in this Canadian museum's collection.

Obscure Freemasons still live in D.C.’s largest private residence.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

The first memorial dedicated solely to the Black troops who fought for the Union.

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

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

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

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

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The world's second largest single-dish radio telescope, once used to contact E.T.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Built by the patriotic residents of Boonsboro in a single day.