The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The ancient tomb acts as a calendar that keeps perfect time.

A beautiful geyser under environmental threat.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Tubing through a cave lit with glowworms is a magical underground experience.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Elevated freight railway turned wildly successful urban park.

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

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Northern Ireland's Brobdingnagian stepping stones.

The first declared National Monument in the United States.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A trash dump made beautiful by nature's power.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

Stunning wetlands ablaze with pink lotus flowers.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

The legendary building that needed ghostly approval before being built.

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A massive underwater sinkhole made famous by Jacques Cousteau.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.