The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

The final resting place of the Emperor of the United States and Protector of Mexico.

One of the world's largest collections of rare and magnificent bird specimens.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A lonely beacon, precariously perched atop a remote sliver of rock.

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

This stockpile of junked electronic and mechanical gadgets is a favorite among Hollywood prop masters.

The first declared National Monument in the United States.

Naked scientists race around the pole in the frigid cold to try to join Antarctica's exclusive 300 Club.

A wall of chewing gum moonlights as collective art.

This working class sculpture pounds his hammer all the livelong day.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

Because sometimes the most efficient route from A to B isn't a straight line.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

The shortest in the world, this landing strip stretches a mere 1,312 feet before steep cliffs on either end plunge into the Caribbean.

A lake formed in the basin of a massive impact crater takes the shape of an unbroken ring when viewed from above.

An architect's childhood fantasy treehouse made real.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.