An idle pastime becomes a record holder in Boys Town, Nebraska.

The world's only and thus largest collection of its kind celebrates everyday wonder through simple umbrella sheaths.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

This abandoned Brutalist treehouse is a hidden architectural relic.

A wonderful collection of all things Oz is nestled in the heart of Kansas.

One of the oldest surviving bars in the United States, located at the site of the last skirmish of the American Revolution.

The elegant structure of this 19th century railroad bridge creates an illusion of infinity.

This tiny little island has, as the name says, just enough room for its single house.

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

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

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.

There’s a hidden military meme engraved on the World War II Memorial.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A derelict bit of transportation infrastructure hidden in the woods.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.