A wooden street sign is the last remnant of this 400-year-old alleyway.

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

This 16th-century cemetery became a recreational park during the Soviet occupation—today it's a little bit of both.

This set of concrete chambers resonates according to different notes of octaves.

This small Estonian hill is covered in hand-made twig crosses that are said to bring good luck.

A small island dotted with old, historic Finnish buildings.

An abstract monument to a symphonic composer.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

This millstone commemorates a gruesome tale that may have been the source of the city's name.

Rainbow shutters decorate this former police station.

This fountain was once heralded as the largest in the world.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Frequent fliers welcome in this airplane hotel.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

These markers are used to determine the ground stability of the Strip.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

A concrete mushroom that divided Stockholm residents for nearly a century.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

An alien church provides much needed silence in the midst of a Finland shopping center.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

Dine like an American revolutionary at Colonial Williamsburg.

Enjoy dishes that founding fathers once ate at this Colonial Williamsburg pub.

This natural wonder is disappearing at an alarming rate.