Two stone columns flank the grand Venice square, but there were supposed to be three.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

An ornate private entrance to the Vienna subway built specifically for the emperor.

The topiary maze at the Habsburg hunting lodge.

Not many houses move across borders, this one did it twice.

This residence straddles a border between Belgium and the Netherlands.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

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.