A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

Once America's tallest structure, now a Baltimore landmark.

The whole world in one water tank.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

It’s not hard to see why the historic Peabody Conservatory of Music’s library has been described as a “cathedral of books.”

This apartment building designed by a notable Washington D.C. architect housed the Qing Dynasty's Legation.

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

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

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

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

A 19th-century horse lover's bequest led to the construction of this unique fountain in Chicago.

Hidden on the seventh floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

An eponymous directional signpost erected by the first president of the United States.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

Hot Doug's "Hot Dog" Stand.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

The beloved home to all publications indie, erotic, and punky.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.