Quite simply the largest tree in the world (by volume).

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Experience a charming 1930's version of "infotainment."

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

The glowing blue Nymphaeum of Emperor Tiberius.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A little sculpture with a large wardrobe.

Climb inside an iron crystal magnified 165 billion times its normal size.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The whole world in one water tank.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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