This alley-cum-fan gallery in the ex-Nirvana drummer's hometown holds the world's largest drumsticks.

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

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

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

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

Largest Roman Catholic church in North America.

A historic arena where the Beatles played their first concert in the U.S.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The walls of the iconic dome are hollow and have a secret stairway.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

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

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The most accurate timepiece in the world.

A former major munitions plant that has been converted into a sprawling art space.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Exact replica of the ancient monument, but much, much lighter.

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