This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Caves famous for the dragon-slaying saint who lived there.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The steepest classic funicular in the world glides along a dizzying incline.

Thousands of American timepieces on display in the former clock-making capital of the country.

This small-town pizzeria won the Hollywood lottery.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Home of Philip Johnson, one of the 20th century's most influential architects.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

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.

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

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

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

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

These legendary stone steps were once used to haul coffins up the rockface.

This historic little railroad runs through some of the most beautiful scenery in Germany.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

A fearsome dragon clings to a corner of Munich's city hall.

This Rococo church is known as the most beautiful village church in the world, and does not disappoint.

A Nazi concentration camp and Anne Frank's place of death.

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.