It was once the base for a series of domestic terror attacks.

Site of the longest gun battle in FBI history.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

This modest marker near Notre Dame identifies the very center of Paris.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A swamp and garden tour featuring local wildlife and exotic botanical specimens from around the world.

The first plantation museum in the United States to focus on the lives of enslaved people.

This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

The LSU mascot lived on the college campus in one of the most impressive tiger habitats in the country.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

Crawfish hand pies, Natchitoches meat pies, and all manner of other sweet or savory, flaky-crusted pastries abound here.

Hear the quietest sound from across the dome.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The walls of the iconic dome are hollow and have a secret stairway.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Home to the "Circus" trees created by Axel Erlandson.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.