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

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Two dozen pinball games hidden away inside a most unlikely location.

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

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

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

The United States Capitol's former columns still stand.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

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

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

The school tested mustard gas for the U.S. Army during World War I.

Largest Roman Catholic church in North America.

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

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

100 years later, they're still down there.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

There’s a special club house at the top for the bell ringers.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.