A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

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

These azure waters were thought to lead to the Mayan Underworld.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The magical, mossy forest that inspired Princess Mononoke.

A reproduction of earth's many biomes.

A modernist landscape of water and sci-fi concrete.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

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

This structure among the trees was the result of divine inspiration.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

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

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Stalactites and stalagmites in a beautifully lit cave.

360° views of the city plus five floors of optical illusions and hands-on science.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

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

A library of rare occult books in Los Angeles.