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.

A celebrity from the late Cretaceous period.

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

The most decorated dog of World War I is preserved in the Smithsonian.

The walls of the iconic dome are hollow and have a secret stairway.

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

There’s a hidden military meme engraved on the World War II Memorial.

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

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

These planks were originally installed to hold the dead.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

A world-class observatory in the California desert.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

A couple turned their front yard into an artistic masterpiece.

One of the largest trees of its kind in California.

North America's largest accredited model railroad museum.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

One man's quest for the ultimate road trip vehicle.

This historic graveyard was partially paved over to create a streetcar line.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

This Pringle-shaped ledge makes for the perfect photo op.

Along a California highway is a kind of Jurassic Park made of metal.

This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.