In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

This bike path was sunk below water level for maximum wonder.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This modern arts center is built around a gem of late-Baroque architecture.

A rare example of World War I trenches from the British front.

This abandoned Belgian fortress is purposefully being left to nature.

Hiding the longest subterranean river known in the world.

Meet the bronze beloved pet to a family of famous peeing statues.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

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

Climb inside an iron crystal magnified 165 billion times its normal size.

Is this a portal to another side of the cosmos?

A road runs through the middle of this small Austrian chapel.

Bizarrely-painted church designed by a controversial artist.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Austria's very first and only nuclear power station was completed but never used.

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

The shell of a medieval fortress offers commanding views of the area it once protected.

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

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.