What a great old thread!

US:
Yosemite Valley
Grand Canyon
Bryce Canyon, Utah - Navajo Loop Trail
Statue of Liberty
Crater Lake, OR
Bandon dunes and beaches, OR
Giant Redwoods, CA

Europe:
Florence: DAVID
Venice: my jaw was dropped for 24 hours.
Tuscany: drive thru Chianti
Athens: Cape Sounion & Acropolis
Santorini: Caldera view