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

A tunnel with windows, so you don't miss out on the impressive views.

A nostalgic bibliographic gem.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

Known as the most scenic route in Sri Lanka, this train line is steeped in history and offers an unparalleled view of the country.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

Brass bricks outline the locations of Edinburgh's lost, lively market stalls.

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

Possibly the world's smallest museum is home to one exhibit that sheds light on the capital city's dark criminal history.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

A reminder to choose water over wine since 1888.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

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

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

A terrific purveyor of natural history objects and curios.

Elevated freight railway turned wildly successful urban park.

A dilapidated dock tells the story of Titanic’s missed arrival.