The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The school tested mustard gas for the U.S. Army during World War I.

The Conduit Road Schoolhouse is one of the last one-room schoolhouses remaining in Washington, D.C.

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

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

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

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

See six states, pickled freaks, rocks, and antiques.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

When ecosystems collide in the arid Southwest.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A ghost town at the airport is now a refuge for blue butterflies.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

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

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Also known as the Cathedral of the Plains, this church holds the distinction of being one of the "8 Wonders of Kansas."

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.