A Roman spa buried deep beneath the City of London.

The commemorative stone column conceals a secret laboratory.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

The site of Paul Revere's historic two lantern warning.

From horses to stainless-steel trucks, this iconic Providence burger wagon is one of the oldest mobile diners in the country.

The inventor of the Coney Island hot dog rests in a grand mausoleum in Brooklyn.

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

The longest step street in the city.

A memorial for military police dogs in the former U.S. air base.

These bronze statues depict the early days of trading in Singapore.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

A monument dedicated to a lone, brave invader.

A museum-like shop that has been producing clogs, brushes, and ropes for nearly 200 years.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

Giant cauldrons overflow with Uzbekistan's favorite rice dish at this cavernous dining hall.

Looking for a unifying history, Uzbekistan finds its answer in a 14th Century Turco-Mongol conqueror... despite the fact he wasn't Uzbek.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

Prowl through this sprawling bazaar under a massive Soviet-era dome for delicious eats.