Driving Hayama 2nd Tunnel through a cave

Okayama Prefecture, Japan, holds a secret! Just northwest of Nariwacho Hayama in Takahashi City, you'll find Prefectural Road 300 snaking along the Shimaki River in the Wazan Gorge. But this isn't your average road trip, because here, you actually drive *through* a cave!

Hayama 2nd Tunnel isn't your typical, man-made tunnel. It's a limestone cave carved out by the Shimaki River over eons. Once much bigger, the river whittled it down, but the entrance was just begging for a road. They raised the ceiling to fit cars, and voila!

Now, a word of warning: this tunnel is SHORT (max height 2.5 meters), and NARROW. Think one car at a time, so forget about bringing your RV. Plus, it's completely unlit, so proceed with caution!

The road is paved, thankfully, but those tight squeezes and pitch-black conditions definitely add an element of adventure.

Dug out by hand about a century ago, you can still see the chisel marks in the walls. It's a seriously cool peek into the past.

Because of the narrowness and blind turns, honk your horn before entering. Definitely not suitable for larger vehicles!

This is a quiet rural road, but weekends can bring more curious visitors, so keep an eye out. You can park a car or two at the north entrance. Honestly, exploring on foot is the safest (and coolest) way to experience this incredible spot!