Man-made mineral caves house massive bat colony.

The first designer power line in Estonia.

Mysterious craters may have been home to an ancient cult.

Once standing on solid ground, this slender beacon is a victim of the very shoreline it was charged with announcing.

Legend has it that not even Stalin could pull down the 2015 European Tree of the Year.

This free museum is building a collection of books that are banned, censored or burnt around the world.

A medieval setting reimagined into a unique art alley.

A unique sculpture calls the outside of this steakhouse home.

This park built on a former fortress has a reputation for romance.

Spend the night in 1920s Latvia in this historic recreation and movie set.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

A mansion where wonders of Christmas are celebrated all year long.

Dedicated to the history of mining and minting in a region rich in silver and radium.

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

A massive, abstract lookout tower providing a panoramic view of Prague.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

The 14th-century ruins are said to contain healing powers.

An exceptional assortment of fossils recovered from private collections.

A beloved tribute to the Fab Four and the freedoms they inspired.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.