“I’m looking for a little-known obsidian deposit at a place called Las Pilas,” said geologist Chris Lloyd. “Want to come along?”

Several amazing caves close to Guadalajara will be presented to the public during a series of talks I will give at the Tec de Monterrey university, beginning in February.

In 2011 I described the Seven Falls of Tonala as “one of greater Guadalajara’s best – but least known – natural beauty spots.” 

“Foreigners often complain about Mexicans shooting off cohetes (rockets) for certain feast days,” said my neighbor Jorge.

The other day I got a call from the United States. “Peter Greenberg is in town and would like to interview you for his radio program,” a cheery voice said.

What is the world’s longest cave? That’s the easiest question I’ve ever had to answer in nearly 50 years of exploring caves.