This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A Jenga-style cylindrical tower of books that appears to go on forever.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A strange house built only at night, with rumored mystic inspiration.

Every autumn, this hillside is ablaze with red summer cypress.

Olfactory delights in San Francisco's Botanical Gardens.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

The atmospheric road was never meant to be so creepy.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A hand-built folk art installation covered with messages of God's love.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Stroll through a wonderland of stupendous moss-covered trees.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Banksy gives themself artistic license with this piece of London street art.

A semi-scholarly approach to sex.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A winding path built in secret on the edge of the continent.