Seven Caves at La Jolla, California

Postcard US-3934052 to France shows the Seven Caves of La Jolla, near San Diego, California. Nestled between La Jolla Cove and La Jolla Shores, only one of caves is accessible by land while the other six can only be accessed by guided kayaking. Housed in a seventy-five million year old sea cliff, each of them has a unique name: White Lady, Little Sister, Shopping Cart, Sea Surprize, Arch Cave, Sunny Jim’s Cave, and Clam’s Cave.

Sunny Jim’s Cave, named after a cartoon character from a brand of cereal that was common at the turn of the century because of the similarity of the shape of their mouths, is the only known land accessed cave along the California coastline. In history, the cave's tunnel, leading to Coast Boulevard in La Jolla, was carved out by Chinese immigrant laborers for smuggling Chinese and other immigrants into the United States. Those intriguing caves were also once used to smuggle illegal whisky during the prohibition from 1920 to 1933.

Swallow Grotto

Postcard TW-1240742 from Taiwan shows Swallow Grotto (Yantzkou 燕子口), a section of the Central Cross-Island Highway 500 meters from the Jinheng Park (靳珩公園) near Hualien, where the Liwu River twists and turns in the deep and narrow gorges. It is part of the Taroko National Park in Taiwan.

Several tunnels had to be built for the highway to pass through cliffs. Visitors could walk through the tunnels, enjoy the sight of streams below, and numerous small swallow grottos on the marble cliffs. However, swallows have moved away due to heavy human impacts.

Pigtail Bridges

Postcard US-2711416 from Minnesota shows an aerial view of two pigtail bridges and one of the tunnels on Iron Mountain Road, ascending 17 miles or 27 kilometers from Custer State Park to the entrance of Mount Rushmore National Memorial, in the Black Hills, Rapid City, South Dakota. Drivers will get a 360° panorama of the area that has many unique and beautiful scenic roads. Jess Stryker has a Youtube video showing driving through the one-lane tunnel, horseshoe curve, and 360° loop over and under one of the pigtail bridges. The Mount Rushmore came into view when exiting the tunnel.

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Model Car for Chicago "L" Train

Postcard US-2375509 has a template to make a 1:160 scale model car for the Chicago "L" Train - Red Line. Chicago's "L" Train was first built as an elevated steam line to the 1893 World's Columbian Exposition, and later evolved into a public transit system with 1,100 cars and 290 miles of track. The Red Line is the busiest route in the city, running through Chicago from north to south and under a subway tunnel downtown.