A spherical "micro-nation" in the heart of Vienna.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

This unassuming oasis elevated just above the busy streets of Jerusalem offers one of the best views of the Old City.

Tel Aviv's popular neighborhood went though endless waves of transformation.

A stunning mosque owes its design to an Ottoman ruler nicknamed "the Butcher."

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

This historic rec center in the heart of Israel is a bastion of peace and togetherness.

A striking series of six bridges connect islands in Indonesia.

The busy transport hub is home to the tallest airport slide in the world.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

The only quarter of the Old City not dedicated to a major world religion.

A modern-day cabinet of curiosities housed in a 300-year-old inn.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The home of the Dead Sea Scrolls is an abstract modernist dream.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

This historic stone bridge has an entire neighborhood clinging to its sides.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This lurid German fountain plots the sad course of marriage from dating to death.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The prototype for all Nazi concentration camps.