Kīlauea Iki Trail

The Kīlauea Iki Trail on the Big Island of Hawaii offers an otherworldly experience: the chance to hike directly across a solidified, still-steaming lava lake inside a volcanic crater. In 1959, this crater erupted sustainedly, shooting fountains of lava 1,900 feet into the air and filling the basin with a fiery lake. Today, the surface has crusted over into a jagged floor of jet-black 'pahoehoe' (smooth) and 'a'a' (sharp) lava rock. The hike begins in a dense, lush, tropical rainforest of native ohia trees and giant hapu'u tree ferns along the crater's rim before plunging 400 feet down the steep walls. Hikers then follow a path marked by stone cairns ('ahu') directly across the desolate, cracked, steaming expanse of the crater floor, walking over active volcanic vents.

The Krimml Waterfalls are the tallest in Europe, dropping 380 meters in three massive tiers from the Krimmler Ache glacial river. The waterfall trail (Wasserfallweg) is a historical path that climbs alongside the falling water, offering multiple viewpoints (Kanzeln) where you can feel the spray and the thunderous power of the water. Beyond the top fall, the trail opens into the stunning Krimmler Achental, a classic U-shaped glacial valley that leads toward the high peaks of the Reichenspitz group.