A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Built in 1859, this eagle-topped archway marks the entrance to Brigham Young’s property.

A fully functional, commercial, miniature art gallery.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

This church in Pittsburgh is home to the largest collection of religious relics in North America.

This little museum in the town where zombies were born celebrates the living dead.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

Remember and reflect at this 9/11 memorial site.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

At 207 feet, one of the world's longest continuous escalators.

The site of the climactic scene from the classic horror film is now a historic landmark.

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

The only Leonardo Da Vinci painting in the Western Hemisphere.

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.

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

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

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

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

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.