An enormous, inside-out glass globe built in 1935.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

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

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

Centuries-old hoofprints and wagon tracks reveal themselves after a good winter storm.

These three lighthouses played a fundamental role in the maritime life of Eastham.

Five candy-colored villages on the Italian Riviera.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

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

Keeping Ballard's heritage alive with delicious, lightly battered Alaskan wild cod.

A colorful statue honoring the local salmon in glass and bronze.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

This Puget Sound military post has a long, turbulent history as a gateway to the Pacific.