The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

An unassuming secret door once led to a legendary watering hole.

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

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

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

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Tiny communists hammer away on the Olomouc Astronomical Clock.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Looming communist pillar with a Czech twist.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Belly up to the bar in Cowtown, don't forget to buy some boots.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

"X" marks the spot of an echo chamber in the middle of a plaza.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

This 220-year-old house is a reminder of New York City's Dutch past.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.