One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A celebrity from the late Cretaceous period.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The tunnel under the Capitol Building where Congress takes out its trash.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

An icon among Florida's pre-Disney tourist attractions.

A wall of chewing gum moonlights as collective art.

A walk through the historic city center, under the streets of Seattle.

The home of one of California's most important horticulturalists wilts amidst a lovely park.

Historic funicular railway, believed to be the shortest railroad in the world.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

Also known as the Founding Church of Scientology.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

A rotating cast of guys and dolls in front of a Washington, D.C. building.