One of the most desired is attached to Harlem Hill, a notoriously steep incline in New York's Central Park.

WSJ: The Last Place Lance Armstrong Can Race

There are meandering trails, reservoir views and wide grassy picnic areas along the moderately steep incline to the top of the extinct caldera.

BBC: Portland's urban adventures

During the three-hour climb up rocky switchbacks to the pass, we stomp through several steep spots blanketed in knee-deep snow and ice. (You really feel those 30 pounds shifting around on your back as you try to maintain your balance.) We're forced to detour around one switchback and shimmy up a slick, steep incline of green brush, holding on to plants for leverage--and praying for solid foot positions.

FORBES: Magazine Article

All of these friction points make the entrepreneurial journey a steep uphill incline.

FORBES: Show Thanks For Entrepreneurs -- And Lend A Hand

The slopes are craggy, storm-blasted and steep, and food is pretty much limited to potatoes and whatever animals you can chase up a 50-grade incline without falling down the adjacent precipice.

CNN: Takanakuy: The fighting festival of Peru