This medieval manor house was hastily fortified when it found itself in the middle of the Scottish fight for independence.

The once-a-day siren is a reminder of the days before time was standardized.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

A unique hotel for the artistic soul.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

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.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Bell tower juts out from a village buried under a lake.

Five candy-colored villages on the Italian Riviera.

Pilgrimage site for star-crossed lovers.

A sunken idol welcomes parishioners to Davy Jones' Locker.

This winding road through an Italian canyon may be the most scenic drive in the world.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

Three bridges straddle a stream, one stacked upon the other.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

The western face was supposedly left clock-less to snub the Welsh.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

This tallest folly in the world began its life as an elaborate factory chimney.