Park Secrets: This new series spotlights overlooked aspects of America's national parks (8 and 8:30 p.m. Travel).
Best Friends Forever: J.K. Simmons and Mimi Kennedy guest star on a new episode of the sitcom (8:30 p.m. NBC).
America's Next Top Model: Pop music's Estelle joins the contestants for a photo shoot in this new episode (9 p.m. KTLA).
Nova: The science series examines maritime mishaps including the recent Costa Concordia disaster (9 p.m. KOCE).
Behind the Music: Rap music's Nas is profiled in this new installment "(9 p.m. VH1).
America Revealed: "Nation on the Move" looks at traffic control in the skies and on the streets (10 p.m. KOCE).
Josh Blue: Sticky Change: A "Last Comic Standing" winner is featured in this new stand-up special (11 p.m. Showtime).
180 Degrees South: Present-day adventurers retrace a 1968 trek to Patagonia in this picturesque 2010 documentary (7:30 p.m. Showtime).
The Endless Summer: Surf's up and then some in this classic 1968 travelogue (8 p.m. TCM).
The Marriage Chronicles: Three married couples look to spice things up at a retreat in this 2012 tale (9:30 p.m. BET).
Baseball: The Rangers visit the Red Sox (4 p.m. ESPN2); the Cubs meet the Marlins (4 p.m. WGN America); the Dodgers battle the Brewers (5 p.m. FS Prime); and the Angels host the Athletics (7 p.m. FSN).
Hockey: The NHL playoffs continue with the Rangers vs. the Senators (4:30 p.m. CNBC), the Penguins vs. the Flyers (4:30 p.m. NBCSP) and the Kings vs. the Canucks (7 p.m. NBCSP).
Basketball: The Magic play the Celtics (5 p.m. ESPN), the Clippers visit the Nuggets (6 p.m. MyNet) and the Lakers take on the Warriors (7:30 p.m. KCAL, ESPN).