France's national museum of scientific and industrial instruments.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This museum houses an imposing skeleton army comprised of creatures great and small.

148 feet long and in the middle of a verdant forest.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

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

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A common entry point to the Griffith Observatory trail holds its own wonders.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Bioluminescent firefly squid light up this Japanese fishing port.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

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

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

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

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

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A bizarre roadside attraction and the first instance of miniature golf in the world.

An abandoned castle owned and ignored by Masons carries a cursed history.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Rare recess caves fill this unbelievably beautiful Ohio park.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A very classy 1920s-era bar right in Grand Central Station.