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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

FDR's Art Deco hospital tower was hopelessly inefficient.

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

A star fort along the C&O Canal in western Maryland that protected America in three wars.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

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

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

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

In an alley not far from where two great highways meet, byways of a very different sort are honored.

The world's largest collection of the world's largest objects is in one small Illinois town.

Community bookshelf of 25-foot-tall book spines.

Cannon designed to fire an atomic warhead.

This historic railroad hotel built from Kansas limestone was once the most popular hotels for traveling salesmen in the midwest.

This tiny old water tower once doubled as a makeshift jail.

A unique attraction and museum dedicated to exploring iconic roadside structures.

This artsy public restroom is shaped like a giant john.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

A 20-foot-tall egg painted in a traditional Czech patterns by the Czech community in Wilson, Kansas.

Home of mutant livestock.

Massive still life just off the highway in Kansas.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.