The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

A celebration of Colombia’s premier contemporary artist.

The world's first crowdfunded skyscraper has not gone quite to plan.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

The national park was once a plantation estate.

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

This unique historical monument features large concrete spheres designed to resemble fallen stars.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

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

Parking garage where Bob Woodward met Watergate source "Deep Throat."

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

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

FDR's Art Deco hospital tower was hopelessly inefficient.