This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Christ's blood allegedly preserved in a Belgian town.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

The world's largest reflecting pool is just two centimeters deep.

If they push on just the right spot, even the weakest person can move this titanic boulder.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Limestone grottoes turns everyday objects into stone.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One part local history, 99 parts gruesome haunted house.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

New York City's only preserved family home from the 19th century.

Elevated freight railway turned wildly successful urban park.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The first green space constructed on an elevated viaduct.