The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The only Leonardo Da Vinci painting in the Western Hemisphere.

Perhaps the most scandalous statue of America's first president.

The National Park Service’s best-kept secret with views that rival any in D.C.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

This Costa Rican topiary park is a surreal garden of unearthly delights.

A hidden world of exotic succulents and cacti.

A gathering of green robots at the Googleplex.

From the Difference Engine to the Cray-1, all under one roof.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The oldest farmer's market in America is so ancient it was approved by the King of England.

A field of nothing but boulders which resembles a giant's gravel driveway.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of the world's heaviest musical instruments towers within a popular urban park.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The modern birthplace of Irish freedom.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.