This sandwich shop has a century-old elevator behind a sheet of plexiglass.

The U.S. Fish Commission’s effort to mass produce carp.

A derelict bit of transportation infrastructure hidden in the woods.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

The romance of early commercial flight still fills this Art Deco destination.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

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

The unbelievably opulent home built for an infamous newspaperman.

What was once the largest NFL stadium.

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

Every drop of D.C. tap water flows through this old waterworks.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

This Old Testament garden features 100 plants from biblical times.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

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

Twenty-eight years after this local landmark was washed ashore by hurricane Hugo, it was washed away by hurricane Irma.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

The most accurate timepiece in the world.

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