This geothermal hot spring hides beneath a slowly growing mineral dome.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Take a drunken tour inside the world's largest known geode.

A speakeasy takes on Chicago's drinking culture.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A self-built castle made by a mysterious man.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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

A museum befitting the city responsible for supplying the majority of the world's LSD.

The first declared National Monument in the United States.

This abandoned amusement park was built on a site with a dark history.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

Mysterious rocks that ring musically when struck.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The United States Capitol's former columns still stand.

Home of an evil witch famous within southern folklore.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A technicolor place of worship for Elevationists.