This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A haunting tribute to pioneering photographer Clover Adams.

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

Largest Roman Catholic church in North America.

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

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

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

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

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

A historic neighborhood church is reborn as a psychedelic arts collective.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

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

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

There's a crumbling old mansion inside the Smithsonian National Zoo.

The towering figures were created from the cemetery's fallen old-growth trees.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.