The terrain rises sharply. The trails scramble over steep rocks. Be prepared when climbing to Maine's highest point, experts advise.

Tim Keiderling and Esther Keiderling, both of Ulster Park, New York, set out to hike the summit on Sunday, officials said.

Both Tim and Esther Keiderling, who went missing Sunday while hiking Mount Katahdin in Maine, have been found dead. Harsh weather and rugged terrain hampered search efforts.