These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

The most famous location in China was home to whole dynasties worth of imperial rulers.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

Once an imperial lake garden, anyone can now visit this city park.

Built entirely of interlocking pieces, construction of this Chinese Muslim house of worship required zero nails.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

Metro station with a claim to rock n' roll fame.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Tiny memorials honor individual victims of the Holocaust.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

A restaurant and observation deck built in a unique broadcasting antenna.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

Dedicated to one of the darkest moments in Irish history.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The poems Nathaniel Hawthorne and his wife Sophia etched into its windows are still visible today.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."