Antarctica is no longer a frontier.

Exhibit A: The Lonely Planet Guide to Antarctica.

Exhibit B: The gift shop at the South Pole.

Exhibit C: Guided tours.

Exhibit D: The existence of the Antarctica Internet Country Code, .aq

...and the clincher:

Exhibit E: The road the United States is building to the South Pole. Additional comments on the project from a US Antarctic worker at this excellent site here. (Scroll down to just over half-way.)