Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

An original apothecary from 1792.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Brain collection and database that narrows the gap between man and animal.

An astounding collection of medical specimens, including bits of President Lincoln.

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The system of air guns are fired off remotely to scare any trespassing avians.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

A haunting tribute to pioneering photographer Clover Adams.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

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

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

The most decorated dog of World War I is preserved in the Smithsonian.

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Literal "money laundering."

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.