Three Borders tower

Sight·GemmenichMentioned by National Geographic

In the coverage1 story

National GeographicSep 28

6 of the Best Bike Trails in Europe

Across the continent, rail-trail conversions and other greenways offer travelers a way to slow down and immerse themselves in cobblestone squares, historic cathedrals, and other wonders.

Observation deck for panoramic views of fertile countryside.

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