The most confusing clock in New York.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A very classy 1920s-era bar right in Grand Central Station.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

Walk 2,300 feet above the ground on the "Troll's Tongue."

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

Lehigh Valley barge No. 79 still gets tugged along - but now it houses a museum and unusual performances.

Brooklyn vintners creating world-class wine in a city not known for its vineyards.

Four cars from the old system were once on display, but were removed in 2014.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Elevated freight railway turned wildly successful urban park.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

World Trade Center memorial likened to a woman's sexual organ.

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

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

A modern addition to the Greenpoint skyline.

Nature and beauty amidst pollution and industrial wreckage.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".