The house where John Wilkes Booth conspired with his co-conspirators.

Largest Roman Catholic church in North America.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

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

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A tiny, unassuming park in Tampa that belongs to the Republic of Cuba.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

The oldest dim sum restaurant in the United States is a nostalgic jewel.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

Only hotel where you can legally launder money.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This private residence was the template for one of the most beloved television homes of all time.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The exterior of this home was used for the hit television show, The Brady Bunch.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

A geological mystery on Camelback Mountain.

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