The beautiful, ornate weather station is the most popular geocache in Salzburg.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The beautiful baroque library of the Hapsburg empire.

Apartment complexes built into huge repurposed natural gas tanks.

Baroque celebration of the end of the Great Plague of Vienna.

A silly medieval mural preserved on the side of a Viennese house.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

Watch butterflies take flight before you fly.

Singapore's landscaping project is home to 18 incredible Supertrees.

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

The location of the world's first telescope demonstration.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

A historic Montreal market that was the city's agricultural hub for over century.

The blinking light atop the iconic landmark has been sending secret messages for decades.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.