A stunning mosque owes its design to an Ottoman ruler nicknamed "the Butcher."

The only Bahá'í house of worship in North America and one of only a handful worldwide.

The birthplace of Appalachia's only first lady, who some have dubbed the United States' "first female president."

A 19th-century cemetery device to ensure that the prematurely buried would be "saved by the bell."

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

A gardener's enduring labor of love is spread throughout a small Vermont town.

A gorilla holding a VW Beetle isn't what you'd expect in rural Vermont.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

Journey through various trails to discover a land before time along the Chazy Fossil Reef.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

The 28,000-year-old specimen is remarkably intact.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

Go take a picture with the inventor of the daguerreotype photographic process.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Decades before the scandal, this staircase on the river was a literal "water gate."

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.