This stunning Connecticut mansion is actually just a one-room-deep hoax.

A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

Underground tunnels remain beneath this abandoned mental asylum.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Op-art architecture designed for happiness.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A small but immensely extravagant palace built by the "Night King."

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

The beautiful, ornate weather station is the most popular geocache in Salzburg.

The fairy tale castle of the "fairy-tale king."