The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

Dine on old-school red sauce fare at a former mob hang out and film set for The Sopranos.

Home to items never before seen by the public.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

A half-size replica of the World Trade Center towers above Tulsa.

The storied steakhouse is the last in a long line of Lebanese-owned supper clubs in Tulsa.

Songwriter Leon Russell transformed this church into a recording studio used by many legendary musicians.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

One of the best examples of Art Deco architecture in the United States.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

These massive mitts are made of 30 tons of devotional bronze.

An acoustic anomaly with a mysterious cause.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Largest Roman Catholic church in North America.

A haunting tribute to pioneering photographer Clover Adams.

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

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.